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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6c16eadb91d432428a428fd4a735bbd46d16b2fbff9c0daed5a81e4de713b0' 
  AND token = 'BErizbMTIBSGr44WfCM0mD8zFtZ/0fqJS0nubqOzYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}